US7821760B2 - Counter electromotive force prevention unit - Google Patents
Counter electromotive force prevention unit Download PDFInfo
- Publication number
- US7821760B2 US7821760B2 US10/558,355 US55835504A US7821760B2 US 7821760 B2 US7821760 B2 US 7821760B2 US 55835504 A US55835504 A US 55835504A US 7821760 B2 US7821760 B2 US 7821760B2
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- US
- United States
- Prior art keywords
- electromotive force
- counter electromotive
- diode
- battery
- prevention unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
- H02H9/047—Free-wheeling circuits
Definitions
- This invention relates to a counter electromotive force prevention unit of a direct-current power source for absorbing the counter electromotive force that occurs in inductive loads.
- FIG. 12 Taking the example of an automotive battery as a direct-current power source, automotive batteries ordinarily use a chargeable secondary battery.
- 20 is a battery
- 21 is a self-starting motor
- 22 is electrical equipment
- 23 is a generator
- 24 is a starter switch
- 25 is a rectifier diode
- 26 is an automatic on/off switch that is automatically engaged when the electromotive force of the charging generator 23 is equal to or greater than the voltage of the battery.
- Inductance components inductive loads
- the electrical equipment 22 such as a car air conditioner and car audio. Counter electromotive force occurs from these inductance components, and this becomes noise that is superimposed on the voltage of the output terminal.
- This type of counter electromotive force due to inductance components causes grating noise in car audio and radio speakers, and also causes flickering in car navigation and television images.
- noise is reduced by regenerating the noise that occurs in a blower motor 201 to a battery power source VB by means of a diode 206 ; the harmonic components of the noise are attenuated by a capacitor 224 ; the noise that occurs between battery power sources due to the switching of a switching element 202 is attenuated by an LC filter configured from an electrolytic capacitor 222 and inductance 223 ; the magnitude of noise generated when the switching element 202 is off is reduced by means of the inductance 223 ; and the voltage fluctuations between the battery power sources are mitigated by the electrolytic capacitor 222 (for example, see Japanese Unexamined Patent Application, First Publication No. H07-283797).
- This invention was made in light of the above circumstances. It is an object of the present invention to provide a counter electromotive force prevention unit in a circuit arrangement configured so as to supply power from a direct-current power source such as a battery to loads including inductive loads via a circuit element or a circuit unit that conducts switching operations, which is capable of preventing the occurrence of noise due to the counter electromotive force generated by the inductive loads during the switching operations by the circuit element or the circuit unit that conducts the switching operations.
- a direct-current power source such as a battery
- the counter electromotive force prevention unit of a first aspect of this invention is a counter electromotive force prevention unit in a circuit arrangement configured so as to supply power from a direct-current power source such as a battery to a load including an inductive load via a circuit element or a circuit unit that conducts a switching operation, the counter electromotive force prevention unit comprising: a diode which is connected in parallel to an output terminal of the direct-current power source and absorbs a counter electromotive force generated by the inductive load; and a capacitor which is connected in parallel to the diode.
- a counter electromotive force prevention unit in the circuit arrangement configured so as to supply power from the direct-current power source such as the battery to the load including the inductive load via the circuit element or the circuit unit that conducts the switching operation, a counter electromotive force prevention unit is installed that has a diode connected in parallel to the output terminal of the direct-current power source and absorbs the counter electromotive force that occurs due to the inductive load, and the capacitor which is connected in parallel to the diode, with the result that it is possible to effectively prevent the occurrence of noise due to the counter electromotive force that occurs due to the inductive load during the switching operation by the circuit element or the circuit unit that conducts the switching operation.
- the counter electromotive force prevention unit of a second aspect of this invention is a counter electromotive force prevention unit for a battery comprising: a blocking diode and a fuse element that fuses with overcurrent which are serially connected between a positive lead wire and a negative lead wire that are respectively connected to a positive terminal and a negative terminal of a direct-current supply source; and a capacitor which is connected in parallel with the blocking diode.
- solderless terminals are provided on ends of the positive lead wire and the negative lead wire.
- the counter electromotive force prevention unit of the second aspect of this invention it is possible to rapidly suppress noise and prevent the counterflow of unnecessary current to electrical equipment by inserting counter voltage absorbing diodes in, for example, an automotive battery.
- the electrical equipment can operate normally, and the entire automobile can be operated smoothly.
- noise of the FM radio installed in the automobile is reduced, and its sound quality is improved, and that noise of the AM radio is reduced.
- shock caused by shift operation is eliminated in automatic vehicles, resulting in a quieter ride and improved fuel consumption ratio.
- FIG. 1 is a circuit diagram that shows the configuration of an audio circuit that applies this invention.
- FIG. 2 shows a circuit that replaces the amplifier in the audio circuit shown in FIG. 1 with a switch, and that inserts a battery on the secondary side of the transformer instead of inputting alternating current signals to the transformer.
- FIG. 3 is a drawing that shows the electric potential waveform at point A when the switch 4 conducts on/off operations in the circuit shown in FIG. 2 .
- FIG. 4 is a drawing that shows a circuit where the diode D 2 is removed from the circuit shown in FIG. 2 .
- FIG. 5 is a drawing that shows a circuit where the capacitor C 1 and diode D 2 are removed from the circuit shown in FIG. 2 .
- FIG. 6A and FIG. 6B are waveform drawings that show the state of change in electric potential at point A when the switch 4 is made to conduct on/off operations in the circuit shown in FIG. 5 .
- FIG. 6C is a waveform drawing that shows the state of change of electric potential at point C when the switch 4 is made to conduct on/off operations in the circuit shown in FIG. 5 .
- FIG. 7 is a drawing that shows a circuit where the capacitor C 1 is removed, while the diode D 2 remains in the circuit shown in FIG. 2 .
- FIG. 8A and FIG. 8B are waveform drawings that show the state of change in electric potential at point A when the switch 4 is made to conduct on/off operations in the circuit shown in FIG. 7 .
- FIG. 9 is a drawing that shows an example of configuration of a switching power source that applies this invention.
- FIG. 10 is a drawing that shows an external view of a counter electromotive force prevention unit according to an embodiment of this invention.
- FIG. 11 is a circuit diagram that shows the state where the counter electromotive force prevention unit according to this invention is connected to a battery.
- FIG. 12 is an electric circuit diagram of an automotive battery and automotive equipment.
- FIG. 13 is a circuit diagram that shows an example of a conventional noise filter.
- FIG. 1 The configuration of an audio circuit that applies this invention is shown in FIG. 1 .
- the audio circuit that applies this invention is provided with a transformer 1 having input terminals 50 and 51 to which input signals are applied, a diode D 1 that is connected to the secondary side of the transformer and that rectifies the alternating current signals that are inputted, a smoothing capacitor C 1 , an amplifier 2 , and a speaker 3 .
- a diode D 2 for absorbing counter electromotive force is connected in parallel to the smoothing capacitor C 1 .
- FIG. 2 shows the circuit shown in FIG. 2 when the amplifier 2 is replaced by a switch 4 , and when a battery 5 is inserted with the illustrated polarity on the secondary side of the transformer 1 instead of having alternating current signals inputted to the input terminals 50 and 51 of the transformer 1 .
- FIG. 3 shows the voltage waveform at point A on the cathode side of the diode D 1 at the time of on/off operation of the switch 4 .
- the electric potential of point A begins to rise from 0V in the positive direction, and rises to a prescribed level. Subsequently, the electric charge stored in the capacitor C 1 is discharged via the diode D 1 and the secondary winding of the transformer 1 so that it returns to the battery 5 which is the power source. The electric charge is also discharged via the diode D 2 . As a result, the electric potential of point A begins to drop, and is restored to the 0 V level at time t 4 .
- FIG. 4 shows a circuit where the diode D 2 is removed from the circuit shown in FIG. 2 .
- the switch 4 when the switch 4 is made to conduct on/off operation, the electric potential waveform at point A is almost the same as in FIG. 3 .
- FIG. 5 shows a circuit where the capacitor C 1 and the diode D 2 have been removed from the circuit shown in FIG. 2 .
- FIGS. 6A to 6C show waveforms expressing the state of change in electric potential at point A and point C in this circuit when the switch 4 is made to conduct on/off operation. As shown in FIG. 6B , when the switch 4 is switched from the on state to the off state, one discerns a major change in electric potential at point A compared to the case shown in FIG. 3 .
- the electric potential at point D is a waveform that inverts the electric potential at point C.
- FIG. 7 shows a circuit where the capacitor C 1 is removed while the diode D 2 remains in the circuit shown in FIG. 2 .
- FIGS. 8A and 8B show electric potential waveforms at point A when the switch 4 is made to conduct on/off operation in this circuit. As shown in FIG. 8A , the electric potential waveform of point A at the time when the switch 4 is switched from the off state to the on state is not completely identical to the case of the circuit shown in FIG. 5 (the waveform shown in FIG. 6A ), but there is little change.
- the counter electromotive force occurring in the drive coil 3 a of the speaker 3 when the switch 4 is switched from the on state to the off state is absorbed by the diode D 2 that is connected in parallel to the smoothing capacitor C 1 , and supplied to the battery 5 via the diode D 1 and the secondary winding of the transformer 1 .
- the counter electromotive force occurring in the drive coil 3 a of the speaker 3 when the switch 4 is switched from the on state to the off state is absorbed by the diode D 2 , and recharging is conducted in the capacitor C 1 so that point A becomes a positive polarity, and point B becomes a negative polarity.
- This capacitor C 1 has not only the inherent function of smoothing the pulsating current after the alternating current signals have been rectified by the diode D 1 , but also the function of smoothing the counter electromotive force occurring in the inductive loads such as the drive coil 3 a of the speaker 3 .
- the capacitor C 1 has the function of returning the harmonic components produced by the counter electromotive force generated in inductive loads such as the drive coil 3 a of the speaker 3 to the battery side.
- FIG. 9 shows an example of configuration of a switching power source that applies this invention.
- a rectifier circuit 10 there is a rectifier circuit 10 , a capacitor C 10 for smoothing an output voltage of the rectifier circuit 10 , a counter electromotive force absorbing diode D 11 that is connected in parallel to the capacitor C 10 , a comparator 11 , an oscillator 12 , a transformer 13 , diodes D 12 and D 13 , and a smoothing circuit consisting of a coil L 1 and capacitor C 12 .
- alternating current signals for example, pulse signals of 100 kHz
- the comparator 11 into which the output of the rectifier circuit 10 and the output of the oscillator 12 are inputted, according to the results of comparison of the output of the rectifier circuit 10 and the output of the oscillator 12 .
- These alternating current signals undergo transformation by the transformer 13 , and rectified by the diode D 12 , and the smoothed direct current voltage is outputted to output terminals 62 and 63 by the smoothing circuit consisting of the coil L 1 and the capacitor C 12 .
- the switching power source of the aforementioned configuration contains numerous inductances which are inductive loads, counter electromotive force occurs in the transformer 13 , coil L 1 and so on in a manner similar to the previously discussed the drive coil of the speaker of the audio circuit whenever switching is conducted by the comparator.
- it is possible to absorb the generated electromotive force by connecting a diode with the polarity shown in FIG. 9 in parallel to the smoothing capacitor C 10 .
- FIG. 10 shows a specific configuration of the counter electromotive force unit according to an embodiment of this invention.
- FIG. 10 shows an external view of the counter electromotive force prevention unit 100 according to an embodiment of this invention.
- a blocking diode 104 and a fuse 105 are serially connected between a positive lead wire 102 and a negative lead wire 103 , and a capacitor 106 is connected in parallel to the blocking diode 104 .
- the fuse 105 is removable from a fuse socket 107 so that the fuse 105 can be replaced when it fuses.
- Solderless terminals 108 and 109 are attached to the tips of the positive lead wire 102 and negative lead wire 103 , and establish secure contact when connection is made to the positive electrode and negative electrode of the battery, and also reduce contact resistance.
- FIG. 11 is a circuit diagram of the state where the counter electromotive force prevention unit 100 of this invention is connected to a battery 110 .
- 111 is a self-starting motor
- 112 is electrical equipment
- 113 is a generator
- 114 is a starter switch
- 115 is a rectifier diode
- 116 is an automatic on/off switch that is automatically engaged when the electromotive force of the charging generator 113 is equal to or greater than the voltage of the battery.
- the counter electromotive force prevention unit 100 is directly connected to the positive terminal and negative terminal of the battery 110 .
- Inductance components exist not only in the self-starting motor 111 as a matter of course, but also in the electrical equipment 112 such as a car air conditioner and car audio. Counter electromotive force is generated from these inductance components, and this constitutes noise that is superimposed on the voltage of the output terminal.
- the counter electromotive force generated by the inductance components of the self-starting motor 111 , electrical equipment 112 and charging generator 113 flows to the blocking diode 104 where it is absorbed, and it does not appear at the output terminal of the battery 110 .
- the capacitor 106 In the case where the battery 110 has a 12 V rating, it is possible to employ the capacitor 106 with capacitance of 0.47 ⁇ F and a withstand voltage of 250 V.
- a counter electromotive force prevention unit for direct-current power sources which absorbs the counter electromotive force generated in inductive loads, and which is applied to audio circuits, switching power sources and the like.
- the counter electromotive force prevention unit of this invention is able to effectively prevent occurrence of noise due to the counter electromotive force generated by inductive loads at the time of switching operations by a circuit element or circuit unit that conducts switching operations.
- the battery counter electromotive force prevention unit of this invention is able to rapidly suppress noise, and prevent the counterflow of unnecessary current to electrical equipment. Accordingly, when applied, for example, to an automotive battery, it is possible to correctly operate electrical equipment, and the entire automobile operates smoothly.
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- Dc-Dc Converters (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Emergency Protection Circuit Devices (AREA)
- Secondary Cells (AREA)
Abstract
Description
Claims (3)
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-150411 | 2003-05-28 | ||
JP2003150411 | 2003-05-28 | ||
JP2004-93260 | 2004-03-26 | ||
JP2004-093260 | 2004-03-26 | ||
JP2004093260A JP4256810B2 (en) | 2003-05-28 | 2004-03-26 | Back electromotive force prevention unit |
PCT/JP2004/007645 WO2004109887A1 (en) | 2003-05-28 | 2004-05-27 | Counter electromotive force preventive unit |
Publications (2)
Publication Number | Publication Date |
---|---|
US20070159134A1 US20070159134A1 (en) | 2007-07-12 |
US7821760B2 true US7821760B2 (en) | 2010-10-26 |
Family
ID=33513351
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/558,355 Expired - Fee Related US7821760B2 (en) | 2003-05-28 | 2004-05-27 | Counter electromotive force prevention unit |
Country Status (3)
Country | Link |
---|---|
US (1) | US7821760B2 (en) |
JP (1) | JP4256810B2 (en) |
WO (1) | WO2004109887A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1749701A1 (en) * | 2005-08-03 | 2007-02-07 | Ford Global Technologies, LLC | Circuit arrangement for regenerative energy of vehicles |
JP2007331405A (en) * | 2006-06-12 | 2007-12-27 | Shigeki Shiratori | Electric circuit stabilization device of automobile and automobile equipped with the same |
JP2008168815A (en) * | 2007-01-12 | 2008-07-24 | Kyokuto Kaihatsu Kogyo Co Ltd | Drive control device of load receiving platform elevating/lowering device |
JP2011132887A (en) * | 2009-12-24 | 2011-07-07 | 5Zigen International Inc | Vehicular power supply stabilizing device |
JP4783478B1 (en) * | 2011-01-28 | 2011-09-28 | オーディオ・ラボ有限会社 | Induction signal elimination circuit |
DE102017210303B3 (en) | 2017-06-20 | 2018-11-22 | Audi Ag | Method and battery management system for operating a traction battery in a motor vehicle and motor vehicle with such a battery management system |
CN114180094B (en) * | 2021-12-08 | 2024-02-09 | 中国兵器装备集团自动化研究所有限公司 | Tethered multi-rotor unmanned aerial vehicle power management device and method |
Citations (14)
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US3564333A (en) * | 1968-02-21 | 1971-02-16 | Nat Standard Co | Electric welder that uses magnetic amplifier to supply firing signals for controlled rectifier |
US4415959A (en) * | 1981-03-20 | 1983-11-15 | Vicor Corporation | Forward converter switching at zero current |
JPH0292799A (en) | 1988-09-28 | 1990-04-03 | Suzuki Motor Co Ltd | Voice alarm output switching device for outboard engine |
US4971583A (en) | 1988-05-31 | 1990-11-20 | Suzuki Jidosha Kogyo Kabushiki Kaisha | Apparatus for outboard engine for switching to voice alarm output |
JPH079849A (en) | 1993-06-23 | 1995-01-13 | Neox Lab:Kk | Sunvisor for vehicle |
JPH07283797A (en) | 1994-04-08 | 1995-10-27 | Calsonic Corp | Noise filter for automobile |
JPH0847244A (en) | 1994-07-28 | 1996-02-16 | Motor Jidosha Kk | Noise-proof device and noise-proof filter of power converter |
US5617016A (en) * | 1993-10-22 | 1997-04-01 | Sgs Microelectronics, S.R.L. | Buck converter with operating mode automatically determined by the load level |
JPH1183023A (en) | 1997-08-29 | 1999-03-26 | Mitsubishi Electric Corp | High-frequency heating cooker |
US6083369A (en) * | 1997-02-21 | 2000-07-04 | Toyota Jidosha Kabushiki Kaisha | Heater control system for an air-fuel ratio sensor in an internal combustion engine |
US20010035697A1 (en) * | 2000-04-01 | 2001-11-01 | Johannes-Jorg Rueger | Time- and event-controlled activation system for charging and discharging piezoelectric elements |
US6316907B1 (en) * | 1999-06-16 | 2001-11-13 | Stmicroelectronics S.R.L. | Filtering and voltage raising circuit for connection between a car radio and a motor-vehicle battery |
JP2001326300A (en) | 2000-05-18 | 2001-11-22 | Nissan Motor Co Ltd | Semiconductor device |
JP2002094348A (en) * | 2000-09-13 | 2002-03-29 | Soshin Electric Co Ltd | Dc line filter |
-
2004
- 2004-03-26 JP JP2004093260A patent/JP4256810B2/en not_active Expired - Lifetime
- 2004-05-27 US US10/558,355 patent/US7821760B2/en not_active Expired - Fee Related
- 2004-05-27 WO PCT/JP2004/007645 patent/WO2004109887A1/en active Application Filing
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
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US3564333A (en) * | 1968-02-21 | 1971-02-16 | Nat Standard Co | Electric welder that uses magnetic amplifier to supply firing signals for controlled rectifier |
US4415959A (en) * | 1981-03-20 | 1983-11-15 | Vicor Corporation | Forward converter switching at zero current |
US4971583A (en) | 1988-05-31 | 1990-11-20 | Suzuki Jidosha Kogyo Kabushiki Kaisha | Apparatus for outboard engine for switching to voice alarm output |
JPH0292799A (en) | 1988-09-28 | 1990-04-03 | Suzuki Motor Co Ltd | Voice alarm output switching device for outboard engine |
JPH079849A (en) | 1993-06-23 | 1995-01-13 | Neox Lab:Kk | Sunvisor for vehicle |
US5617016A (en) * | 1993-10-22 | 1997-04-01 | Sgs Microelectronics, S.R.L. | Buck converter with operating mode automatically determined by the load level |
JPH07283797A (en) | 1994-04-08 | 1995-10-27 | Calsonic Corp | Noise filter for automobile |
JPH0847244A (en) | 1994-07-28 | 1996-02-16 | Motor Jidosha Kk | Noise-proof device and noise-proof filter of power converter |
US6083369A (en) * | 1997-02-21 | 2000-07-04 | Toyota Jidosha Kabushiki Kaisha | Heater control system for an air-fuel ratio sensor in an internal combustion engine |
JPH1183023A (en) | 1997-08-29 | 1999-03-26 | Mitsubishi Electric Corp | High-frequency heating cooker |
US6316907B1 (en) * | 1999-06-16 | 2001-11-13 | Stmicroelectronics S.R.L. | Filtering and voltage raising circuit for connection between a car radio and a motor-vehicle battery |
US20010035697A1 (en) * | 2000-04-01 | 2001-11-01 | Johannes-Jorg Rueger | Time- and event-controlled activation system for charging and discharging piezoelectric elements |
JP2001326300A (en) | 2000-05-18 | 2001-11-22 | Nissan Motor Co Ltd | Semiconductor device |
JP2002094348A (en) * | 2000-09-13 | 2002-03-29 | Soshin Electric Co Ltd | Dc line filter |
Non-Patent Citations (3)
Title |
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Japanese Patent Office, International Search Report and Written Opinion, PCT/JP2004/007645, Mailed Sep. 21, 2004 (9 pages). |
Japanese Patent Office, Japanese Office Action in counterpart JP Application No. 2004-093260, issued Jun. 24, 2008, 4 pages. |
Paul Horowitz, The Art of Electronics, 2006, The Press Syndicate of the University of Cambridge, Second Edition, 229-230. * |
Also Published As
Publication number | Publication date |
---|---|
JP4256810B2 (en) | 2009-04-22 |
WO2004109887A1 (en) | 2004-12-16 |
JP2005012994A (en) | 2005-01-13 |
US20070159134A1 (en) | 2007-07-12 |
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